Uplink Power Control via Dynamic MPR Adjustment
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Solution Overview
Problem
In 3GPP LTE systems, there is a challenge in determining the optimal uplink transmission power to balance service coverage with interference prevention, as reducing transmission power or limiting resource blocks can lead to decreased coverage and interference issues.
Innovation Solution
A method for determining transmission power for 64 QAM modulation in wireless devices, which involves using multi-cluster transmission and carrier aggregation techniques to manage peak-to-average power ratio (PAPR) and maximum power reduction (MPR) values, ensuring compliance with emission requirements and maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is decreased to prevent interference between adjacent frequency bands, then interference is reduced, but service coverage is decreased
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the MPR (Maximum Power Reduction) value based on the actual frequency interval between adjacent bands and channel bandwidth. Instead of using a fixed power reduction, the system calculates an appropriate MPR value (e.g., 0 dB, 1 dB, 2 dB, or 3 dB) according to the specific frequency separation, allowing optimal balance between interference prevention and coverage maintenance for each operating condition.
Solution Approach 2:
The patent implements dynamics by making the transmission power control adaptive rather than static. The base station determines the actual frequency interval between adjacent bands and dynamically selects the MPR value accordingly. This dynamic adjustment mechanism allows the system to respond to changing frequency allocations and maintain optimal performance under different deployment scenarios.
2Object-affected harmful factors
If transmission resource blocks are limited to reduce interference, then interference between adjacent bands is reduced, but service coverage and capacity are decreased
Solution Approach 1:
The patent changes the parameter of transmission power control by introducing MPR values that are specifically tailored to different channel bandwidths and frequency intervals. Instead of limiting resource blocks, the system adjusts power parameters (MPR = 0, 1, 2, or 3 dB) to achieve interference control while preserving full resource block utilization and service coverage.
3Reliability
If MPR value is increased to ensure compliance with emission requirements, then emission compliance is improved, but transmission power is reduced affecting service quality
Solution Approach 1:
The patent applies parameter changes by establishing a mapping between channel bandwidths and appropriate MPR values. For example, 20 MHz bandwidth may use MPR = 2 dB while 10 MHz uses MPR = 1 dB. This parameterized approach ensures emission compliance is achieved with the minimum necessary power reduction, thereby maintaining service quality while meeting regulatory requirements.
Solution Approach 2:
The patent implements feedback by having the base station determine the actual frequency interval between adjacent bands and use this information to select the appropriate MPR value. This feedback loop ensures that the system only applies power reduction when and where necessary to meet emission requirements, avoiding unnecessary transmission power loss and maintaining optimal service quality.
Data Source
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AI summary
A disclosure of the present specification provides a method for determining uplink transmission power by a wireless device. The transmission power determination method may comprise the steps of: determining whether transmission of uplink data uses 64 quadrature amplitude modulation (QAM) or not; determining whether transmission of the uplink data corresponds to multi-clustered transmission or not; determining whether transmission of the uplink data is to be performed through a single carrier or is to be performed through a plurality of carriers according to carrier aggregation; and determining a maximum power reduction (MPR) value, which is to be applied to transmission of the uplink data, according to the determination results. Here, when transmission of the uplink data uses the 64 QAM, corresponds to the multi-clustered transmission, and is performed through the single carrier, a first MPR value may be determined; and, when transmission of the uplink data uses the 64 QAM, corresponds to the multi-clustered transmission, and is performed through the plurality of carriers, a second MPR value may be determined.